A search for charged Higgs from top quark decay at the CERN p̄p collider

Abstract The process t→H + b, H + →τ + v, τ + →hadrons+ v and its charge conjugate are investigated by seeking an excess in number of observed τ's beyond that expected from the standard model under the assumption of e-τ universality. No such excess is found and new regions of the m H − m t plane are excluded for B(H + → τ v) = 0.5 and 1.0. In addition, the ratio of couplings of the τ and e to the W is precisely measured as g w τ / g w e = 1.02 ± 0.04(stat.)±0.04(syst.).